Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method of playing back individualized content on a playback device, comprising: reading a first part of an encrypted data set having first key information indicating a first key; decrypting the first part of the encrypted data set using a first playback key that is stored on the playback device and that matches the first key, creating first playback data; playing back the first playback data; reading a second part of an encrypted data set having second key information indicating a second key; reading a third part of an encrypted data set having third key information indicating a third key; selecting a second playback key that matches either the second key or the third key and that is stored on the playback device; decrypting the second part of the encrypted data using the second playback key when the second playback key matches the second key or decrypting the third part of the encrypted data using the second playback key when the second playback key matches the third key, creating second playback data; and playing back the second playback data.
This invention relates to a method for playing back individualized content on a playback device, addressing the challenge of securely delivering and decrypting encrypted content tailored to specific devices. The method involves reading an encrypted data set divided into multiple parts, each containing key information that specifies a required decryption key. The first part of the data set is decrypted using a first playback key stored on the device, which must match the first key indicated in the key information. Once decrypted, the resulting playback data is played back. The method then proceeds to read a second and third part of the encrypted data set, each containing key information for a second and third key, respectively. The device selects a second playback key from its stored keys that matches either the second or third key. Depending on the match, the device decrypts either the second or third part of the data set using the selected key, generating playback data which is then played back. This approach ensures that only authorized devices with the correct keys can access and play back the content, enhancing security and personalization in content delivery.
2. The method of claim 1 , further comprising receiving the encrypted data set from a playback stream.
A system and method for processing encrypted data involves receiving an encrypted data set from a playback stream. The encrypted data set is decrypted using a decryption key, which is derived from a key derivation function applied to a shared secret and a unique identifier associated with the data set. The decrypted data is then processed to extract a payload, which is further analyzed to determine its integrity and authenticity. If the payload is valid, it is used to generate a response, which is then encrypted using an encryption key derived from the same key derivation function. The encrypted response is transmitted back to the source of the playback stream. This method ensures secure communication by leveraging cryptographic techniques to protect data during transmission and processing. The system is particularly useful in environments where data integrity and confidentiality are critical, such as in financial transactions, secure communications, or digital rights management. The use of a unique identifier ensures that each data set is processed independently, reducing the risk of unauthorized access or tampering. The key derivation function provides an additional layer of security by dynamically generating encryption and decryption keys based on shared secrets and unique identifiers, making it difficult for unauthorized parties to intercept or decrypt the data.
3. The method of claim 2 , further comprising identifying the playback device using the first, second, and third keys and the playback stream.
This invention relates to secure content playback systems, specifically methods for identifying playback devices to prevent unauthorized access. The problem addressed is ensuring that only authorized devices can access and play protected content, such as digital media, by verifying device identity through cryptographic keys and playback streams. The method involves generating a first key from a device identifier, a second key from a content identifier, and a third key from a user identifier. These keys are used to authenticate the playback device. The device is identified by combining the first, second, and third keys with the playback stream, ensuring that only devices with the correct cryptographic keys can access the content. This approach enhances security by requiring multiple authentication factors, reducing the risk of unauthorized playback. The method also includes verifying the playback stream to confirm it matches the expected content, further preventing tampering or unauthorized distribution. By integrating device, content, and user identifiers, the system ensures that only legitimate devices can play protected content, addressing challenges in digital rights management and content security.
4. The method of claim 1 , wherein the first playback data is data for a first frame of video, and the second playback data is data for a second frame of video.
This invention relates to video playback systems, specifically addressing the challenge of efficiently managing and synchronizing video frame data during playback. The method involves processing two distinct sets of playback data corresponding to different video frames. The first playback data represents a first video frame, while the second playback data represents a second video frame. The system ensures that these frames are accurately decoded and rendered in sequence, maintaining proper synchronization and visual continuity. The method may include steps such as receiving, decoding, and displaying the frame data, with additional processing to handle timing, buffering, or error correction as needed. The invention aims to improve video playback quality by ensuring that frames are processed in the correct order, reducing artifacts and improving user experience. The technique is particularly useful in applications where real-time or high-definition video playback is required, such as streaming services, video conferencing, or multimedia playback devices. By distinguishing between different frames and managing their data separately, the system enhances playback reliability and performance.
5. The method of claim 4 , wherein the first and second frames of video form a frame-based video watermarking.
A method for embedding a watermark into video frames to enhance digital content security and ownership verification. The technique involves using two distinct video frames to create a frame-based watermarking system. The first frame contains the original video content, while the second frame is modified to include the watermark data. The watermark is embedded in a way that is imperceptible to viewers but detectable through specialized analysis. This approach ensures that the watermark remains robust against common video processing operations such as compression, scaling, and noise reduction. The method is particularly useful for copyright protection, content authentication, and tamper detection in digital video distribution. By leveraging frame-based watermarking, the technique provides a reliable way to embed and extract watermark information without compromising video quality. The system can be applied to various video formats and resolutions, making it versatile for different applications in media security.
Unknown
September 8, 2020
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